/* ===== STEEL TEAL & CREAM THEME ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+KR:wght@300;400;500;600;700;800&display=swap');

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root {
  --bg: #10304e;
  --bg2: #0d2840;
  --bg3: #163858;
  --card: rgba(255,255,255,0.04);
  --card-border: rgba(221,213,162,0.15);
  --primary: #ddd5a2;
  --primary-light: #ede6bb;
  --secondary: #a8c5da;
  --accent: #ddd5a2;
  --teal-light: #2a6080;
  --text: #e8e0b8;
  --text-muted: #9db8cc;
  --text-dim: #4e7088;
  --gradient: linear-gradient(135deg, #1a4a72, #0d2840);
  --gradient-text: linear-gradient(135deg, #ede6bb, #ddd5a2, #b8d4e8);
  --gradient-warm: linear-gradient(135deg, #ddd5a2, #c8bc85);
  --glow: 0 0 40px rgba(221,213,162,0.2);
  --glow-sm: 0 0 20px rgba(221,213,162,0.12);
  --glow-teal: 0 0 30px rgba(42,96,128,0.3);
  --shadow: 0 8px 32px rgba(8,20,35,0.5);
  --radius: 16px;
  --radius-sm: 8px;
  --font: 'Inter','Noto Sans KR',sans-serif;
  --nav-h: 72px;
}

html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:var(--font);
  background:linear-gradient(160deg, #1a4060 0%, #10304e 40%, #0a2038 100%);
  background-attachment:fixed;
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg2)}
::-webkit-scrollbar-thumb{background:var(--teal-light);border-radius:3px}

/* ===== NAVBAR ===== */
.navbar {
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:1000;
  display:flex;align-items:center;padding:0 5%;
  transition:all 0.3s ease;
}
.navbar.scrolled{background:rgba(13,40,64,0.95);backdrop-filter:blur(20px);border-bottom:1px solid var(--card-border)}
.nav-logo{font-size:22px;font-weight:800;background:var(--gradient-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav-links{display:flex;gap:32px;margin:0 auto}
.nav-links a{font-size:14px;font-weight:500;color:var(--text-muted);transition:color 0.2s}
.nav-links a:hover{color:var(--primary-light)}
.nav-cta{background:var(--gradient-warm);color:#1a3040;padding:10px 24px;border-radius:100px;font-size:14px;font-weight:700;transition:all 0.2s;border:none;cursor:pointer}
.nav-cta:hover{opacity:0.9;transform:translateY(-1px);box-shadow:var(--glow-sm)}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px}
.mobile-toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:all 0.3s}

/* ===== HERO ===== */
.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:var(--nav-h) 5% 80px;position:relative;overflow:hidden}
.hero::before{
  content:'';position:absolute;
  width:700px;height:700px;
  background:radial-gradient(circle, rgba(42,96,128,0.25) 0%, transparent 70%);
  top:-150px;left:50%;transform:translateX(-50%);
  pointer-events:none;
}
.hero::after{
  content:'';position:absolute;
  width:500px;height:500px;
  background:radial-gradient(circle, rgba(221,213,162,0.07) 0%, transparent 70%);
  bottom:-50px;right:5%;
  pointer-events:none;
}
.hero-inner{max-width:760px;margin:0 auto;position:relative;z-index:1}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(221,213,162,0.08);
  border:1px solid rgba(221,213,162,0.3);
  color:var(--primary-light);
  padding:8px 18px;border-radius:100px;font-size:13px;font-weight:600;margin-bottom:28px;
}
.hero-title{font-size:clamp(38px,6vw,68px);font-weight:900;line-height:1.1;margin-bottom:24px;letter-spacing:-0.02em}
.hero-title .hl{background:var(--gradient-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{font-size:18px;color:var(--text-muted);margin-bottom:40px;line-height:1.7;max-width:560px;margin-left:auto;margin-right:auto}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:64px}
.btn-primary{
  background:var(--gradient-warm);
  color:#162030;
  padding:14px 32px;border-radius:100px;font-size:15px;font-weight:700;
  display:inline-flex;align-items:center;gap:8px;
  transition:all 0.3s;border:none;cursor:pointer;box-shadow:var(--glow-sm);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--glow)}
.btn-outline{
  background:transparent;color:var(--text);padding:14px 32px;border-radius:100px;font-size:15px;font-weight:600;
  border:1px solid rgba(221,213,162,0.3);
  display:inline-flex;align-items:center;gap:8px;transition:all 0.3s;cursor:pointer;
}
.btn-outline:hover{border-color:var(--primary);color:var(--primary-light);transform:translateY(-2px)}
.hero-stats{display:flex;gap:48px;justify-content:center;padding-top:48px;border-top:1px solid rgba(221,213,162,0.12)}
.stat{text-align:center}
.stat-num{display:block;font-size:36px;font-weight:900;background:var(--gradient-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}
.stat-label{font-size:13px;color:var(--text-muted);margin-top:4px}

/* ===== SECTION COMMONS ===== */
section{padding:100px 5%}
.container{max-width:1200px;margin:0 auto}
.section-tag{
  display:inline-block;
  background:rgba(221,213,162,0.08);
  border:1px solid rgba(221,213,162,0.25);
  color:var(--primary);
  padding:5px 14px;border-radius:100px;font-size:12px;font-weight:700;
  letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px;
}
.section-title{font-size:clamp(28px,4vw,44px);font-weight:800;line-height:1.2;margin-bottom:16px;letter-spacing:-0.02em}
.section-title .hl{background:var(--gradient-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.section-desc{font-size:16px;color:var(--text-muted);max-width:520px}
.section-header{margin-bottom:60px}

/* ===== GLASS CARD ===== */
.glass{
  background:rgba(255,255,255,0.04);
  border:1px solid rgba(221,213,162,0.12);
  border-radius:var(--radius);
  backdrop-filter:blur(12px);
  transition:all 0.3s;
}
.glass:hover{
  border-color:rgba(221,213,162,0.3);
  transform:translateY(-4px);
  box-shadow:0 12px 40px rgba(8,20,35,0.4), var(--glow-sm);
}

/* ===== WHY SECTION ===== */
.why-section{background:rgba(0,0,0,0.15);backdrop-filter:blur(4px)}
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.why-card{padding:32px;position:relative;overflow:hidden}
.why-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--gradient-warm);opacity:0;transition:opacity 0.3s}
.why-card:hover::before{opacity:1}
.why-icon{font-size:36px;margin-bottom:20px;display:block}
.why-card h3{font-size:18px;font-weight:700;margin-bottom:12px;color:var(--text)}
.why-card p{font-size:14px;color:var(--text-muted);line-height:1.7}

/* ===== MENTOR SECTION ===== */
.mentor-section{background:transparent}
.mentor-layout{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.mentor-tag{font-size:12px;font-weight:700;color:var(--secondary);text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px;display:block}
.mentor-name{font-size:40px;font-weight:900;margin-bottom:8px;background:var(--gradient-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.mentor-role{font-size:15px;color:var(--primary);margin-bottom:24px;font-weight:600}
.mentor-quote{
  background:rgba(221,213,162,0.05);
  border-left:3px solid var(--primary);
  padding:20px 24px;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom:24px;font-size:15px;line-height:1.7;color:var(--text-muted);font-style:italic;
}
.mentor-quote strong{color:var(--primary-light);font-style:normal}
.mentor-desc{font-size:15px;color:var(--text-muted);line-height:1.7}
.mentor-card{padding:28px}
.mentor-card-title{font-size:12px;font-weight:700;color:var(--text-dim);text-transform:uppercase;letter-spacing:.1em;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--card-border)}
.mentor-timeline{display:flex;flex-direction:column;gap:20px}
.mentor-timeline-item{display:flex;gap:16px;align-items:flex-start}
.timeline-dot{width:10px;height:10px;border-radius:50%;background:var(--gradient-warm);flex-shrink:0;margin-top:6px;box-shadow:0 0 10px rgba(221,213,162,0.4)}
.timeline-content{display:flex;flex-direction:column;gap:3px}
.timeline-main{font-size:14px;font-weight:700;color:var(--text)}
.timeline-sub{font-size:13px;color:var(--text-muted)}

/* ===== CURRICULUM ===== */
.curriculum-section{background:rgba(0,0,0,0.15);backdrop-filter:blur(4px)}
.curriculum-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:start}
.course-card{padding:28px;position:relative;overflow:hidden}
.course-card-featured{border-color:rgba(221,213,162,0.35) !important;box-shadow:0 0 32px rgba(221,213,162,0.1)}
.course-popular{position:absolute;top:0;right:0;background:var(--gradient-warm);color:#162030;padding:6px 16px;border-radius:0 var(--radius) 0 var(--radius-sm);font-size:12px;font-weight:800}
.course-badge{display:inline-block;padding:4px 12px;border-radius:100px;font-size:12px;font-weight:700;margin-bottom:16px}
.course-badge-blue{background:rgba(168,197,218,0.15);color:var(--secondary)}
.course-badge-green{background:rgba(16,185,129,0.15);color:#6ee7b7}
.course-badge-purple{background:rgba(221,213,162,0.12);color:var(--primary-light)}
.course-duration{font-size:13px;color:var(--text-dim);margin-bottom:12px;display:flex;align-items:center;gap:6px}
.duration-icon{font-size:14px}
.course-title{font-size:22px;font-weight:800;margin-bottom:10px;color:var(--text)}
.course-desc{font-size:14px;color:var(--text-muted);margin-bottom:20px;line-height:1.6}
.course-features{margin-bottom:24px;display:flex;flex-direction:column;gap:8px}
.course-features li{font-size:13px;color:var(--text-muted);display:flex;align-items:flex-start;gap:8px;line-height:1.5}
.course-features li::before{content:'✓';color:var(--primary);font-weight:700;flex-shrink:0;margin-top:1px}
.course-footer{margin-top:auto}
.btn-card{width:100%;padding:12px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;border:none;cursor:pointer;transition:all 0.3s;text-align:center;display:block}
.btn-card-primary{background:var(--gradient-warm);color:#162030}
.btn-card-primary:hover{opacity:0.9;transform:translateY(-1px);box-shadow:var(--glow-sm)}
.btn-card-outline{background:transparent;color:var(--text-muted);border:1px solid rgba(221,213,162,0.2)}
.btn-card-outline:hover{border-color:var(--primary);color:var(--primary-light)}
.btn-card-disabled{background:rgba(255,255,255,0.04);color:var(--text-dim);cursor:default}

/* ===== COMPARISON ===== */
.comparison-section{background:transparent}
.comparison-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.comparison-card{border-radius:var(--radius);overflow:hidden;border:1px solid var(--card-border)}
.comparison-before,.comparison-after{padding:20px 24px}
.comparison-before{background:rgba(255,255,255,0.03);border-bottom:1px solid var(--card-border)}
.comparison-after{background:rgba(221,213,162,0.05)}
.comparison-label{display:inline-block;padding:3px 10px;border-radius:100px;font-size:11px;font-weight:700;margin-bottom:10px}
.before-label{background:rgba(168,197,218,0.15);color:var(--secondary)}
.after-label{background:rgba(221,213,162,0.15);color:var(--primary)}
.comparison-before p,.comparison-after p{font-size:14px;color:var(--text-muted);line-height:1.6}
.comparison-arrow{text-align:center;padding:12px;color:var(--text-dim);font-size:20px}

/* ===== REVIEWS ===== */
.reviews-section{background:rgba(0,0,0,0.15);backdrop-filter:blur(4px)}
.reviews-carousel-wrapper{overflow:hidden;position:relative}
.reviews-carousel{display:flex;gap:20px;transition:transform .4s ease;--card-gap:20px;--cards-visible:3}
.review-card{
  width:calc((100% - var(--card-gap) * (var(--cards-visible) - 1)) / var(--cards-visible));
  flex:0 0 calc((100% - var(--card-gap) * (var(--cards-visible) - 1)) / var(--cards-visible));
  padding:24px;border-radius:var(--radius);
  background:rgba(255,255,255,0.04);
  border:1px solid rgba(221,213,162,0.1);
}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#162030;font-weight:700;font-size:16px;flex-shrink:0;background:var(--gradient-warm)}
.review-info h4{font-size:14px;font-weight:700;color:var(--text)}
.review-course{font-size:12px;color:var(--text-muted)}
.review-stars{margin-bottom:10px;font-size:14px;color:var(--primary)}
.review-text{font-size:13px;color:var(--text-muted);line-height:1.7;margin-bottom:10px}
.review-date{font-size:12px;color:var(--text-dim)}
.carousel-controls{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:32px}
.carousel-btn{width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,0.04);border:1px solid rgba(221,213,162,0.2);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text);transition:all 0.2s}
.carousel-btn:hover{background:var(--primary);border-color:var(--primary);color:#162030;box-shadow:var(--glow-sm)}
.carousel-btn svg{width:16px;height:16px}
.carousel-dots{display:flex;gap:8px}
.carousel-dot{width:8px;height:8px;border-radius:50%;background:rgba(221,213,162,0.2);border:none;padding:0;cursor:pointer;transition:all 0.2s}
.carousel-dot.active{background:var(--primary);width:24px}

/* ===== CONTACT ===== */
.contact-section{background:transparent;padding:100px 5%}
.contact-card{
  background:linear-gradient(135deg,rgba(26,74,114,0.5),rgba(13,40,64,0.6));
  border:1px solid rgba(221,213,162,0.2);
  border-radius:24px;padding:60px;
  display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;
  max-width:1200px;margin:0 auto;
  backdrop-filter:blur(16px);
}
.contact-title{font-size:clamp(24px,3.5vw,40px);font-weight:800;line-height:1.2;margin-bottom:16px}
.contact-title .hl{background:var(--gradient-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.contact-desc{font-size:15px;color:var(--text-muted);margin-bottom:28px;line-height:1.7}
.contact-features{display:flex;flex-direction:column;gap:16px}
.contact-feature{display:flex;align-items:flex-start;gap:16px;padding:16px;background:rgba(221,213,162,0.04);border:1px solid rgba(221,213,162,0.12);border-radius:var(--radius-sm)}
.contact-feature-icon{font-size:24px;flex-shrink:0}
.contact-feature h4{font-size:14px;font-weight:700;color:var(--text);margin-bottom:2px}
.contact-feature p{font-size:13px;color:var(--text-muted)}

/* ===== FOOTER ===== */
footer{background:rgba(8,20,35,0.6);border-top:1px solid var(--card-border);padding:32px 5%;text-align:center;color:var(--text-dim);font-size:13px}

/* ===== MODAL ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(5,15,28,0.8);z-index:2000;display:flex;align-items:center;justify-content:center;padding:20px;opacity:0;pointer-events:none;transition:opacity .3s;backdrop-filter:blur(6px)}
.modal-overlay.open{opacity:1;pointer-events:all}
.modal-box{background:linear-gradient(160deg,#1a3d60,#0d2840);border:1px solid rgba(221,213,162,0.2);border-radius:24px;width:100%;max-width:560px;max-height:90vh;overflow:hidden;position:relative;box-shadow:0 24px 64px rgba(0,0,0,0.6)}
.modal-header{padding:24px 28px 0;display:flex;align-items:center;justify-content:space-between}
.modal-header h3{font-size:18px;font-weight:700;color:var(--text)}
.modal-close{width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,0.05);border:1px solid rgba(221,213,162,0.2);cursor:pointer;color:var(--text-muted);font-size:18px;display:flex;align-items:center;justify-content:center;transition:all 0.2s}
.modal-close:hover{background:rgba(221,213,162,0.1);color:var(--primary-light);border-color:var(--primary)}
.modal-content{padding:24px 28px 28px;overflow-y:auto;max-height:calc(90vh - 72px)}

/* ===== FORM ===== */
.contact-form{display:flex;flex-direction:column;gap:14px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.form-row-3{display:grid;grid-template-columns:2fr 1fr 1fr;gap:12px}
.form-group{display:flex;flex-direction:column;gap:6px}
.form-group label{font-size:13px;font-weight:600;color:var(--text-muted)}
.required{color:#f87171}
.form-group input,.form-group select,.form-group textarea{
  background:rgba(255,255,255,0.05);
  border:1px solid rgba(221,213,162,0.18);
  border-radius:var(--radius-sm);padding:10px 14px;
  font-family:var(--font);font-size:14px;color:var(--text);
  outline:none;transition:border-color 0.2s;resize:vertical;
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--primary);background:rgba(221,213,162,0.05)}
.form-group select{cursor:pointer}
.form-group select option{background:#0d2840}
.checkbox-label{display:flex;align-items:flex-start;gap:10px;cursor:pointer;font-size:13px;color:var(--text-muted);flex-direction:row!important;font-weight:400!important}
.checkbox-label input[type="checkbox"]{width:16px;height:16px;flex-shrink:0;margin-top:1px;accent-color:var(--primary)}
.btn-submit{width:100%;padding:14px;border-radius:var(--radius-sm);background:var(--gradient-warm);color:#162030;font-size:15px;font-weight:700;border:none;cursor:pointer;transition:all 0.3s;margin-top:4px}
.btn-submit:hover{opacity:0.9;transform:translateY(-1px);box-shadow:var(--glow-sm)}
.btn-submit:disabled{opacity:0.6;cursor:not-allowed;transform:none}
.form-success{text-align:center;padding:40px 20px}
.success-icon{font-size:48px;margin-bottom:16px}
.form-success h4{font-size:20px;font-weight:700;color:var(--text);margin-bottom:8px}
.form-success p{color:var(--text-muted);margin-bottom:24px}
.btn-secondary{padding:12px 28px;border-radius:100px;background:rgba(255,255,255,0.05);border:1px solid rgba(221,213,162,0.2);color:var(--text);font-size:14px;font-weight:600;cursor:pointer;transition:all 0.2s}
.btn-secondary:hover{border-color:var(--primary);color:var(--primary-light)}

/* ===== ANIMATIONS ===== */
.animate-on-scroll{opacity:0;transform:translateY(28px);transition:opacity .5s ease,transform .5s ease}
.animate-on-scroll.visible{opacity:1;transform:translateY(0)}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .why-grid,.curriculum-grid,.comparison-grid{grid-template-columns:1fr}
  .mentor-layout{grid-template-columns:1fr;gap:32px}
  .contact-card{grid-template-columns:1fr;padding:40px}
  .reviews-carousel{--cards-visible:2}
}
@media(max-width:768px){
  section{padding:70px 5%}
  .nav-links{display:none}
  .mobile-toggle{display:flex}
  .hero-title{font-size:36px}
  .hero-stats{gap:24px}
  .hero-actions{flex-direction:column;align-items:center}
  .reviews-carousel{--cards-visible:1}
  .section-title{font-size:26px}
  .contact-card{padding:28px}
}
@media(max-width:560px){
  .form-row,.form-row-3{grid-template-columns:1fr}
}

/* ===== MOBILE NAV ===== */
.nav-links.active{display:flex;flex-direction:column;position:fixed;top:var(--nav-h);left:0;right:0;background:rgba(13,40,64,0.98);backdrop-filter:blur(20px);padding:24px;border-bottom:1px solid var(--card-border);gap:16px}